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Full text of "Handbook Of Chemical Engineering - I"

MECHANICAL SEPARATION
275
TIMBER BUTTE MILLING Co.
45-in. Submerged Type Akins Classifier with Overflow Raised 10 in. Feed:
Tonnage to classifier 350 tons per 24 hr., dry.    (Feed consists of tailings from
Wilfley roughing tables, Zinc department of mill.) Slope of classifier 2%6 in. to 1 ft.; 8 r.p.m., power required to drive
1.39 hp. Per cent of solids ................................ 41 . 40
Per cent of moisture .............................  58 . GO
Ratio of water to solids ..........................    1 . 42
Products of Classifier:
Sands raised 217 tons per 24 hr., dry.
Per cent of solids ................................    76 . 3
Per cent of moisture .............................    23 . 7
Ratio of water to solids ..........................      0.31
Slimes overflowing 133 tons per 24 hr., dry.
Per cent of solids ................................    23.7
Per cent of moisture .............................    76 . 3
Ratio of water to solids ..........................      3.2
Screens				Feed		Sands		Slimes	
Openings		Mesh	Diameter wire, inches	Per cent weight of material	Per cent weight accumulative	Per cent weight of material	Per cent weight accumulative	Per cent weight of material	Per cent weight accumulative
Inches	Milli-								
	meters								
0.263	6.680	3	0.070						
0.185	4.699	4	0.065						
0. 131	3.327	6	0.036						
0.093	2.362	8	0.032						
0.065	1.651	10	0.035						
0.046	1.168	14	0.025	27.0	27.0	55.0	55.0		
0. 0328	0.838	20	0.0172	11.0	38.0	13.0	68.0	1.9	1.9
0. 0232	0.589	28	0.0125	9.0	47.0	9.0	77.0	9.6	11.5
0.0164	0.417	35	0.0122	7.0	54.0	5.0	82.0	10.3	21.8
0.0116	0.295	48	0. 0072	7.0	61.0	4.0	86.0	9.8	31.6
0. 0082	0.208	65	0.0072	6.5	67.5	2.0	88.0	8.4	41.0
0. 0058	0. 147	100	0.0042	5.0	72.5	2.0	90.0	7.2	47.2
0.0041	0. 104	150	0.0026	5.0	77.5	1.5	91.5	6.8	54.0
0.0029	0.074	200	0.0021	2.5	80.0	1.5	93.0	7.5	61.5
		throiicrh		20.0	100.0	7.0	100.0	38. 5	100.0
	200								
vert the tonnage into cubic feet capacity multiply by 22.    The power required does not exceed 0.01 to 0.02 hp. per ton of dry material treated daily.
In addition to separatory uses the machines may be used in series for crystal or coarse granular washing and as a log washer in cleaning natural phosphates. For these uses the machines would be placed one below another and the wash water from